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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af545521649802a746ec1d7b02dc6f5a988430479fb892ab37b1273ae157ebf3' 
  AND token = '6P+csnqVzmPbww6Rp9E5oX0n5xBR5f1CGu4+DCHfodo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}